[单选题]
A solenoid with 500 wj6a1o u)17l. sgx iy tafan;u95qx.aturns is 0.10 m los *m1y yk-0t bvfa+z*bodnvn(t 56n*d ng and carries a current of 4.0 A. What stren d mt50+nfakt o(6b vyvnsn dz-**y1b*gth of magnetic field will it have at its center?
A. $3.1 \; mT$
B. $6.2 \; mT$
C. $13 \; mT$
D. $25 \; mT$
